I havent been able to get nforce4lan working for the life of me without cpus=1. Both with forcedeth-d.kext that came with rev1 and the forcedeth-nockd.kext IF anyone has some ideas ill be glad to try em. Aside from lan not being reliable with both cpus everything seems to be working right.

System
processor = amd x2 4200+ 939
motherboard = asus a8n5x bios:0902
video card = bfg7950gtoc 512mb (flashed/nvinjected)
ram = 2gig mushkin
hdd=80gigsata(zephys leopard rev1)250gigsata(xp)